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Single green 288-pin DDR4 RDIMM module black chips no heat spreader

OWC

OWC 64GB DDR4 2666 ECC Registered RDIMM 2Rx4 CL19 1.2V

SKU CH-1R8M-8065K

A single 64 GB DDR4 2666 ECC registered RDIMM with CL19 latency, 1.2 V operation and 2Rx4 rank for Synology SA6400 NAS and compatible servers

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB

  • 64GB single module expands server memory capacity
  • DDR4 2666 CL19 registered ECC protects data integrity
  • 2V JEDEC standard voltage reduces power draw
  • 2Rx4 288-pin RDIMM fits compatible NAS and workstations
  • Backward compatible with 2133 and 2400 MHz systems

64GB ECC Registered DDR4 for Servers

This single 64GB module delivers DDR4 2666 speed with CL19 latency at 1.2V. It uses a 288-pin RDIMM form factor with 2Rx4 organisation and on-board ECC. The registered buffer makes it suitable for workstations, servers and compatible NAS systems that require registered memory.

Registered DIMMs require platform support

The module will not work in standard desktop computers that accept only unbuffered memory. It also cannot be mixed with load-reduced or unbuffered ECC modules in the same system. Backward compatibility extends to 2133MHz and 2400MHz bus speeds, but the registered interface remains mandatory.

Straightforward slot installation

Align the notch on the 288-pin edge connector with the motherboard key and press firmly until the retention clips engage. The most common issue is attempting to install the module in a consumer board that lacks registered-memory support, which prevents the system from posting.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $400.99
Pricier than about 66% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.27 per GB
Cheaper than about 61% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D42R464 GB
Total capacity64 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Should I choose the 64GB module or a smaller capacity?

This listing is a single 64GB DDR4 2666 ECC Registered RDIMM; choose it when your server or NAS requires a 64GB stick and has an available 288-pin slot.

What does the 2666MHz rating deliver inside a Synology SA6400?

The module runs at PC4-21300 2666MHz CL19 1.2V, providing error-correcting registered throughput that the SA6400 memory controller can utilise at full rated speed.

Is the DDR4 2666 interface backward compatible with 2133MHz and 2400MHz systems?

Yes, the JEDEC-standard DDR4 2666 RDIMM will also operate in 2133MHz and 2400MHz server, workstation or NAS platforms.

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